SAS Institute Alert Note SN-006019

From: SAS Technical Support (LISTSERV@VM.SAS.COM)
Date: Fri Oct 12 2001 - 10:59:27 EDT

  • Next message: SAS Technical Support: "SAS Note V6-FACTOR-G996"

    SN-006019 ***Alert Note***

    PROC FACTOR METHOD=ML ULTRAHEYWOOD results will be incorrect when a
    communality estimate exceeds 1

    Product: SAS/STAT
    Component: FACTOR procedure
    Priority: ALERT

      If you specify both the METHOD=ML and ULTRAHEYWOOD options on the PROC
      FACTOR statement, and if any of the communalities in the final iteration
      are greater than 1, then all results of the factor analysis are
      incorrect.

      In the sample excerpt below, note that in the 7th (final) iteration,
      one of the communalities is 1.03682. Since it is greater than one, and
      since both METHOD=ML and ULTRAHEYWOOD were specified, the remainder of
      the analysis results will be incorrect.

      Iteration Criterion Ridge Change Communalities
      1 0.3101369 0.000 0.0908 1.02913 0.79229
      2 0.2976415 0.000 0.0371 1.02310 0.82653
      3 0.2944623 0.000 0.0134 1.03226 0.81962
      4 0.2936818 0.000 0.0081 1.03298 0.82736
      5 0.2934573 0.000 0.0031 1.03548 0.82681
      6 0.2933895 0.000 0.0020 1.03609 0.82872
      7 0.2933679 0.000 0.0008 1.03682 0.82889

      There is no circumvention for this problem.

    Keywords:
      proc factor heywood ultraheywood ml maximum likelihood
      proc factor method=ml ultraheywood results will be incorrect when a
      communality estimate exceeds 1
      006019 6019

    SAS Note Revised On: Thu, 11 Oct 2001

    System Version Reported Version Fixed

    AIX 64 bit 8.2 TS2M0
    AIX/6000 7 TSP1
    AIX/6000 8 TSM0
    AIX/6000 8.1 TS1M0
    AIX/6000 8.2 TS2M0
    VM/ESA (CMS) 7 TSP1
    VM/ESA (CMS) 8 TSM0
    VM/ESA (CMS) 8.1 TS1M0
    VM/ESA (CMS) 8.2 TS2M0
    Compaq Tru64 UNIX 7 TSP1
    Compaq Tru64 UNIX 8 TSM0
    Compaq Tru64 UNIX 8.1 TS1M0
    Compaq Tru64 UNIX 8.2 TS2M0
    HP-UX Operating Systems 7 TSP1
    HP-UX Operating Systems 8 TSM0
    HP-UX Operating Systems 8.1 TS1M0
    HP-UX Operating Systems 8.2 TS2M0
    HP-UX 64 bit 8.2 TS2M0
    Intel ABI 8 TSM0
    Intel ABI 8.1 TS1M0
    Intel ABI 8.2 TS2M0
    Linux 8.2 TS2M0
    MIPS ABI 8 TSM0
    MIPS ABI 8.1 TS1M0
    MIPS ABI 8.2 TS2M0
    OS/390 (MVS) 7 TSP1
    OS/390 (MVS) 8 TSM0
    OS/390 (MVS) 8.1 TS1M0
    OS/390 (MVS) 8.2 TS2M0
    IBM OS/2 7 TSP1
    IBM OS/2 8 TSM0
    IBM OS/2 8.1 TS1M0
    IBM OS/2 8.2 TS2M0
    Solaris 7 TSP1
    Solaris 8 TSM0
    Solaris 8.1 TS1M0
    Solaris 8.2 TS2M0
    Solaris 64 bit 8.2 TS2M0
    OpenVMS VAX 7 TSP1
    OpenVMS VAX 8 TSM0
    OpenVMS VAX 8.1 TS1M0
    OpenVMS VAX 8.2 TS2M0
    OpenVMS Alpha 7 TSP1
    OpenVMS Alpha 8 TSM0
    OpenVMS Alpha 8.1 TS1M0
    OpenVMS Alpha 8.2 TS2M0
    Windows NT 7 TSP1
    Windows NT 8 TSM0
    Windows NT 8.1 TS1M0
    Windows NT 8.2 TS2M0
    Windows 2000 Datacenter Server 8 TSM0
    Windows 2000 Datacenter Server 8.1 TS1M0
    Windows 2000 Datacenter Server 8.2 TS2M0
    Windows 2000 Professional 8 TSM0
    Windows 2000 Professional 8.1 TS1M0
    Windows 2000 Professional 8.2 TS2M0
    Windows 2000 Server and Advanced Server 8 TSM0
    Windows 2000 Server and Advanced Server 8.1 TS1M0
    Windows 2000 Server and Advanced Server 8.2 TS2M0
    Windows 95 7 TSP1
    Windows 95 8 TSM0
    Windows 95 8.1 TS1M0
    Windows 95 8.2 TS2M0
    Windows 98 7 TSP1
    Windows 98 8 TSM0
    Windows 98 8.1 TS1M0
    Windows 98 8.2 TS2M0
    Windows ME 8.2 TS2M0

    No Fixes Available

    +-------------------------------------------------------------------------
    + NOTE: To unsubscribe you can reply to this mail with:
    + "SIGNOFF tsnews-l"
    + as the only text in the body of the message (without the double quotes).
    + If you have any questions please send them to SUPPORT@SAS.COM
    +-------------------------------------------------------------------------



    This archive was generated by hypermail 2b29 : Fri Oct 12 2001 - 12:08:38 EDT